Coping with the concurrent heatwaves and ozone extremes in China under a warming climate  

气候变暖背最下“热浪-臭氧”复合极端事件的应对

作　　者：Mengmeng Li Xin Huang Dan Yan Shiyi Lai Zihan Zhang Lei Zhu Yuting Lu Xinyi Jiang Nan Wang Tijian Wang Yu Song Aijun Ding 李蒙蒙;黄昕;严丹;来诗怡;张梓涵;朱雷;卢玉婷;姜欣怡;王楠;王体健;宋宇;丁爱军

机构地区：[1]School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China [2]Frontiers Science Center for Critical Earth Material Cycling,Nanjing 210023,China [3]School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [4]Guangdong Provincial Observation and Research Station for Coastal Atmosphere and Climate of the Greater Bay Area,Shenzhen 518055,China [5]College of Carbon Neutrality Future Technology,Sichuan University,Chengdu 610044,China [6]Department of Environmental Science,Peking University,Beijing 100871,China

出　　处：《Science Bulletin》2024年第18期2938-2947,共10页科学通报（英文版）

基　　金：supported by the National Key Basic Research Development Program of China (2022YFC3701105);the National Natural Science Foundation of China (42293322 and 42275100)。

摘　　要：Intensive human activity has brought about unprecedented climate and environmental crises, in which concurrent heatwaves and ozone extremes pose the most serious threats. However, a limited understanding of the comprehensive mechanism hinders our ability to mitigate such compound events, especially in densely populated regions like China. Here, based on field observations and climate-chemistry coupled modelling, we elucidate the linkage between human activities and the climate system in heatrelated ozone pollution. In China, we have observed that both the frequency and intensity of heatwaves have almost tripled since the beginning of this century. Moreover, these heatwaves are becoming more common in urban clusters with serious ozone pollution. Persistent heatwaves during the extremely hot and dry summers of 2013 and 2022 accelerated photochemical ozone production by boosting anthropogenic and biogenic emissions, and aggravated ozone accumulation by suppressing dry deposition due to water-stressed vegetation, leading to a more than 30% increase in ozone pollution in China's urban areas. The sensitivity of ozone to heat is demonstrated to be substantially modulated by anthropogenic emissions, and China's clean air policy may have altered the relationship between ozone and temperature. Climate model projections further highlight that the high-emission climate-socioeconomic scenario tends to intensify the concurrent heat and ozone extremes in the next century. Our results underscore that the implementation of a strict emission strategy will significantly reduce the co-occurrence of heatwaves and ozone extremes, achieving climate and environmental co-benefits.

关 键 词：HEATWAVE OZONE Biogenic emission Dry deposition Ozone-temperature sensitivity 

分 类 号：X16[环境科学与工程—环境科学] X515